LT1765 datasheet(2/20 Pages) LINER

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LT1765/LT1765-1.8/LT1765-2.5/

LT1765-3.3/LT1765-5

sn1765 1765fas

Input Voltage .......................................................... 25V

BOOST Pin Above SW ............................................ 20V

Max BOOST Pin Voltage .......................................... 35V

SHDN Pin ............................................................... 25V

FB Pin Current ....................................................... 1mA

ABSOLUTE

AXI U

RATI GS (Note 1)

SYNC Pin Current .................................................. 1mA

Operating Junction Temperature Range

(Note 2) ........................................... – 40

°C to 125°C

Storage Temperature Range ................ – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300

°C

ORDER PART

NUMBER

S8 PART

MARKING

1765

LT1765ES8

PACKAGE/ORDER I FOR ATIO

Consult LTC Marketing for parts specified with wider operating temperature ranges.

TJMAX = 125°C, θJA = 90°C/W,

θJC(PIN 4) = 30°C/W

GROUND PIN CONNECTED TO

LARGE COPPER AREA

TOP VIEW

SYNC

SHDN

BOOST

VIN

GND

S8 PACKAGE

8-LEAD PLASTIC SO

FE PACKAGE

16-LEAD PLASTIC TSSOP

TOP VIEW

GND

BOOST

VIN

GND

SYNC

SHDN

GND

θJA = 45°C/W, θJC(PAD) = 10°C/W

EXPOSED PAD SOLDERED TO LARGE

COPPER PLANE

ELECTRICAL CHARACTERISTICS

The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VIN = 15V, VC = 0.8V, Boost = VIN + 5V, SHDN, SYNC and switch open unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Maximum Switch Current Limit

346

Oscillator Frequency

3.3V < VIN < 25V

1.1

1.25

1.6

MHz

Switch On Voltage Drop

I = 3A

270

430

VIN Undervoltage Lockout

(Note 3)

2.47

2.6

2.73

VIN Supply Current

1.3

Shutdown Supply Current

VSHDN = 0V, VIN = 25V, VSW = 0V

µA

Feedback Voltage

3V < VIN < 25V, 0.4V < VC < 0.9V

LT1765 (Adj)

1.182

1.2

1.218

(Note 3)

1.176

1.224

LT1765-1.8

1.764

1.8

1.836

LT1765-2.5

2.45

2.5

2.55

LT1765-3.3

3.234

3.3

3.366

LT1765-5

4.9

5.1

ORDER PART

NUMBER

LT1765EFE

LT1765EFE-1.8

LT1765EFE-2.5

LT1765EFE-3.3

LT1765EFE-5

FE PART MARKING

1765EFE

1765EFE18

1765EFE25

1765EFE33

1765EFE-5

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